VINCENT BUGLIOSI, deputy district attorney. He is 74 and the author of several books, including Helter Skelter (cowritten with Curt Gentry), the definitive account of the case. After the murders people stayed inside their homes with their doors locked. We had heard of burglaries, but not of killers going into homes and mercilessly stabbing people to death. The randomness of it all just terrified L.A. If you’re not safe in your own home, where in the heck are you safe? Overnight the sale of guns and guard dogs skyrocketed, as did the hiring of security guards.